Insulator.



'No.7e1,10 2. PATENTED MAY 31,1904.

M. RANDOLPH.

INSULATOR.

APPLICATION FILED MAR. 12, 1903.

N0 MODEL.

UNITED STATES Patented. May 31, 1904.

PATENT OFFICE.

LEONARDM. RANDOLPH, OF NEWARK, NEW JERSEY.

v INSULATORL SPECIFICATION forming part of Letters Patent No. 761,102, dated May 31, 1904.

Application filed March 12, 1903. Serial No. 147,473. (No model.) I

T0 all whom "it may concern.-

Be it known that I, LEONARD M. RANDOLPH,

a citizen of the United States, residingin New ark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Insulators, of which the following is a specification, reference being had to the accompanying drawings, forming a part hereof.

This invention relates to high-tension insulators.

In cables or wires carrying heavy currents and supported upon insulators considerable difiiculty is experienced in preventing the sparking and consequent leakage of current which constantly occurs, such sparking taking place across the insulators and from a point on the cable adjacent to or within the insulators to the pole. This leakage occurs more particularly in damp weather, at which time moisture condenses in and upon the insulators, thus transforming the same into a more or less efficient conductor. Insulators which have been devised heretofore to overcome such sparking have been constructed with a view toward lengthening the distance between the cable or conducting-wire and the pole between which the sparking takes place, and one of the most common ways in which such lengthening has been effected has been to provide the insulators witha series of petticoats or depending circular flanges to protect the inner parts of the same from rain. Such insulators, however, have generally proven to be ineffective in damp weather, inasmuch as moisture always finds access to the inner parts of the insulators and serves to lessen the sparking distance to such an extent as to permit a constant leakage of current.

The object of this invention is to provide insulators for insulating and supporting cables carrying heavy currents which will effectuall y prevent the sparking and consequent loss of current occasioned in the manner above referred to, and the principle upon which the successful operation of my improved insulator chiefly depends lies in keeping dry a certain length of cable adjacent to the pole. The invention is not limited to any particular structure embodying this principle; but

angles to the plane in Fig. 1.

for purposes of illustration andexplanation. one embodiment of which the invention is. capable is illustrated: in the drawings, in.

which I Figure 1 is a view in elevat1on. Fig. 2 1s a wow in elevat1on taken on a plane at right view, and Fig. 4 is a view in central vertical section taken on the plane indicated by the line f 4 in Fig. 1.

In accordance with the invention the cable or conducting-wire is made to pass through, as distinguished from being fastened upon, the insulating-insulator, and for this purpose the insulator is preferably formed in two parts-a base portion a and a cap portion Z) in either or both of which portions a groove is provided in order to form when the cap and base are fitted together a hole 0 to receive the cable or conducting-wire d. The base portion of the insulator is provided with the usual internal thread 0 for securing it to one of the supporting pins upon the pole cross piece, and in the upper and outer part of the base portion a strengthening-rim or petticoat f is preferably formed. The top of the base portion a is preferably a curved surface convex in form, upon which the under surface of the cap or cover portion 6 has a close fit, the two portions when in use being cemented together. Ears g are formed upon opposite sides of the insulators at the entrance and exit points of the cable or conducting-wire d, and a fastening-wire it may be provided upon each of said ears for securing the cable to the insulators.

When the cable or conducting-wire is to be placed in position in the insulator, a suflicient quantity of cement z' to surround the cable and fill up the space between the cable and the sides of the holes 0 when the cable is in position is first placed in the grooves in the base portion and the cap portion of the insulator. The base portion and top portion are secured together in any desired or suitable manner, preferably by coating the top of the base portion and the under side of the cap portion with cement or other adhesive. The cable or conducting-wire is then raised and laid in the grooves in the base portion and the cap placed in position over the cable or Fig.3 is a plan and accordingly it will be understood that any cement,whethe rinsulating or not, may be employed. The insulators themselves are also preferably manufactured from varnish residue which has been heated and dried and, if

desired, mixed with absorbents or binders, or

both, or composed according to the manner set forth in Letters Patent of the United States granted to me April 29, 1902, No. 698,856, and also in Letters Patent of the United States granted to me May 13, 1902, No. 699,713. I do not intend, however, to limit myself to the use of varnish residue or any other compound or a substance in the manufacture of the insulators hereinbefore described.

I claim as my invention 1. An insulator-support for a cable, said support having a base portion and a cap portion between which is a channel for. the cable, and projections formed partly in the base portion and partly in the cap portion at each end of the channel and through which the channel is extended.

2. An insulator-support for a cable, said support having a base portion and a cap portion between Which is a channel for the cable, a petticoat on the upper part of the base portion, and projections formed partly in the base portion and partly in the cap portionat each end of the channel and through which the channel is extended.

3. An insulator-support for a cable, said support having a base portion and a cap portion between which is a channel for the cable, projections partly formed in the base portion and partly in the cap'portion at each end of the channel and through which the channel is extended, and cement in the channel to pro- LEONARD M. RANDOLPH.

In presence of A. N. JESBERA,

LUcIUs E. VARNEY. 

